oreilly.com

Checked 22 October 2026, 10:10 UTC · via 8.8.8.8
!Passed with warnings
26 passed 3 warnings 0 failed 2 info

Registration

info

.com generic · GoDaddy.com, LLC · expires 2027-05-26

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
GoDaddy.com, LLC
Registered
27 May 1997
Last changed
16 April 2026
Expires
26 May 2027
Status
client delete prohibited, client renew prohibited, client transfer prohibited, client update prohibited
Registry nameservers
a1-225.akam.net, a13-64.akam.net, a16-65.akam.net, a20-66.akam.net, a3-67.akam.net, a4-64.akam.net
RDAP server
https://rdap.verisign.com/com/v1/

Checks

  • i
    .com is a generic TLD (gTLD)
    Generic TLD under an ICANN registry agreement: ICANN-accredited registrars, UDRP and RDAP apply.
    #1
  • ✓ TLD delegated and signed #2
    .com is delegated in the root zone and DNSSEC-signed.
  • ✓ Expires on 2027-05-26 #3
    The registration is valid until 2027-05-26 (215 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client renew prohibited, client transfer prohibited, client update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

a1-225.akam.net, a13-64.akam.net, a16-65.akam.net, a20-66.akam.net, a3-67.akam.net, a4-64.akam.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-225.akam.net, a13-64.akam.net, a16-65.akam.net, a20-66.akam.net, a3-67.akam.net, a4-64.akam.net
NS in the zone
a1-225.akam.net, a13-64.akam.net, a16-65.akam.net, a20-66.akam.net, a3-67.akam.net, a4-64.akam.net
NameserverAddressesNetwork (AS)Glue
a1-225.akam.net193.108.91.225 2600:1401:2::e1AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a13-64.akam.net2.22.230.64 2600:1480:800::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a16-65.akam.net23.211.132.65 2600:1406:1b::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a20-66.akam.net95.100.175.66 2a02:26f0:67::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a3-67.akam.net96.7.49.67 2600:1408:1c::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a4-64.akam.net72.246.46.64 2600:1480:9000::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-225.akam.net, a13-64.akam.net, a16-65.akam.net, a20-66.akam.net, a3-67.akam.net, a4-64.akam.net.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ No glue needed #8
    All nameservers are outside the zone, so no glue records are needed.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 6 IPv4 /24s and 6 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 1 address; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 11 addresses.
  • i
    All nameserver names under .net
    All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.
    #12
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a1-225.akam.net 193.108.91.225NOERROR, 3 ms, authoritativenoyes / yesrefused41824.8
a1-225.akam.net 2600:1401:2::e1NOERROR, 4 ms, authoritativenoyes / yesrefused41824.7
a13-64.akam.net 2.22.230.64NOERROR, 3 ms, authoritativenoyes / yesrefused41824.5
a13-64.akam.net 2600:1480:800::40NOERROR, 3 ms, authoritativenoyes / yesrefused41824.11
a16-65.akam.net 23.211.132.65NOERROR, 3 ms, authoritativenoyes / yesrefused48878.30
a16-65.akam.net 2600:1406:1b::41NOERROR, 3 ms, authoritativenoyes / yesrefused48878.27
a20-66.akam.net 95.100.175.66NOERROR, 4 ms, authoritativenoyes / yesrefused48878.27
a20-66.akam.net 2a02:26f0:67::42NOERROR, 4 ms, authoritativenoyes / yesrefused48878.32
a3-67.akam.net 96.7.49.67NOERROR, 3 ms, authoritativenoyes / yesrefused41824.6
a3-67.akam.net 2600:1408:1c::43NOERROR, 3 ms, authoritativenoyes / yesrefused41824.11
a4-64.akam.net 72.246.46.64NOERROR, 4 ms, authoritativenoyes / yesrefused48878.26
a4-64.akam.net 2600:1480:9000::40NOERROR, 3 ms, authoritativenoyes / yesrefused48878.30

Checks

  • ✓ All respond #14
    All 12 nameserver addresses answered.
  • ✓ All authoritative #15
    Every responding nameserver answers authoritatively for the zone.
  • ✓ No recursion #16
    The nameservers do not answer recursive queries for other domains.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: a1-225.akam.net: "41824.8"; a1-225.akam.net: "41824.7"; a13-64.akam.net: "41824.5"; a13-64.akam.net: "41824.11"; a16-65.akam.net: "48878.30"; a16-65.akam.net: "48878.27"; a20-66.akam.net: "48878.27"; a20-66.akam.net: "48878.32"; a3-67.akam.net: "41824.6"; a3-67.akam.net: "41824.11"; a4-64.akam.net: "48878.26"; a4-64.akam.net: "48878.30". Hide or replace the version string.
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✓ TCP supported #19
    All nameservers answer over TCP.
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

warn

serial 2147484539 · primary a1-225.akam.net

Found

Primary (MNAME)
a1-225.akam.net
Contact (RNAME)
nic-tc.oreilly.com
Serial
2147484539
Refresh / retry
600 s / 1800 s
Expire
5184000 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
a1-225.akam.net (193.108.91.225)2147484539
a1-225.akam.net (2600:1401:2::e1)2147484539
a13-64.akam.net (2.22.230.64)2147484539
a13-64.akam.net (2600:1480:800::40)2147484539
a16-65.akam.net (23.211.132.65)2147484539
a16-65.akam.net (2600:1406:1b::41)2147484539
a20-66.akam.net (95.100.175.66)2147484539
a20-66.akam.net (2a02:26f0:67::42)2147484539
a3-67.akam.net (96.7.49.67)2147484539
a3-67.akam.net (2600:1408:1c::43)2147484539
a4-64.akam.net (72.246.46.64)2147484539
a4-64.akam.net (2600:1480:9000::40)2147484539

Checks

  • ✓ Serial 2147484539 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 10m is outside 20m–1d; retry 30m should be shorter than refresh 10m. Current values: refresh 10m, retry 30m, expire 60d, negative TTL 1h.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver a1-225.akam.net is one of the listed nameservers.
  • ✓ Contact nic-tc@oreilly.com #25
    The SOA RNAME nic-tc.oreilly.com means nic-tc@oreilly.com.
  • ✓ Timestamp serial #26
    The serial 2147484539 is a Unix timestamp (2038-01-19 03:28 UTC).

DNSSEC

warn

Not signed

Found

Validated by resolver
no

Checks

  • !
    Not signed
    The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Records

pass

60 records at the apex

Found

Read from
193.108.91.225:53
TypeValueTTL
SOAa1-225.akam.net. nic-tc.oreilly.com. 2147484539 600 1800 5184000 36003600
NSa1-225.akam.net.3600
NSa13-64.akam.net.3600
NSa16-65.akam.net.3600
NSa3-67.akam.net.3600
NSa4-64.akam.net.3600
NSa20-66.akam.net.3600
A34.169.83.167300
MX5 alt2.aspmx.l.google.com.300
MX5 alt1.aspmx.l.google.com.300
MX10 aspmx2.googlemail.com.300
MX1 aspmx.l.google.com.300
MX10 aspmx3.googlemail.com.300
TXT"_figma_sites_verify_customersuccess"300
TXT"anthropic-domain-verification-dnrkbn=q9EUze0gStRgj4wmYfJUGB6V2"300
TXT"sophos-domain-verification=2ec763c10efd73f2c1dbceaad2983ea0093f02a5882445675f0885ffcf6ce608"300
TXT"_yikoj59erdx9jd4sti8idhii7nvf9x2"300
TXT"ZOOM_verify_t_KNmIKiQZKkyVMeJxpjnA"300
TXT"logmein-verification-code=35fc191f-9043-4216-8bf4-88a05c9e8768"300
TXT"atlassian-domain-verification=GJgQnpbhHf0SwculXnJahDb8IZbK2ZXhc5tVW2ZaEx1rCwyJAN6Mq3JwtfTn5X5s"300
TXT"_acme-challenge.omg.oreilly.com.=70A5bqLKoqpSLcGV6WvAQdrNND1WibK55qbSBMsvOjM"300
TXT"cloudhealth=45f9c4a4-d1eb-4252-b4a1-7d7bb9004040"300
TXT"zapier-domain-verification-challenge=6257ac03-13a2-49f0-bf05-cff1cac20573"300
TXT"1g9d3pyyw5xdhpty461591rx8qtp6y6z"300
TXT"openai-domain-verification=dv-ZU9jzgezaEHhPW3jhinsYiGi"300
TXT"1password-site-verification=YL4MABUTMFAGTAOZTL6TFWZWBU"300
TXT"apple-domain-verification=CObFhoTOkqx87oIs"300
TXT"_awp3n9ftycdhffo7xr550f0qy0e8xuf"300
TXT"MS=ms43057904"300
TXT"_acme-challenge.get.oreilly.com. =L56-9KXCPqPkf5v8bwnTyDjY0p91zvmSsY3mpZ9NmoU"300
TXT"m7zd1crqvftqsgdf8v889l9zdqhk3p07"300
TXT"onetrust-domain-verification=54ccc7392b084e48acfcbc164e2a0ba6"300
TXT"smartsheet-site-validation=fxm70bCfI2yjd4sAuYUP7eTOck334VGo"300
TXT"stripe-verification=FA0A5DF1B861B5632D3B866D38C3327CB0C01D0591C3FAE956610D4BC68DEA64"300
TXT"docker-verification=993bde06-01c2-4c04-a1c6-d840bddb0611"300
TXT"globalsign-domain-verification=aei6eSS-1p0PqmZ3x4jXFoJt_7l6MenGY6u2FV45qG"300
TXT"BlueXPf24d34d4-6c8c-4419-b3be-53abc864b788"300
TXT"adobe-idp-site-verification=ad56f341-bb17-4470-8efa-9a9b9c121a4a"300
TXT"stripe-verification=f9c7baf61f54571ffe67b1c557dea5380c1afd51153b97ca71724438405f855b"300
TXT"openai-domain-verification=dv-p9JzdykFvVDoSGxyY4Y6Y143"300
TXT"calendly-site-verification=KRdabjWvHMSpj0d7HZ7WgAZXIGkbywfZWqJCGrIYd"300
TXT"onetrust-domain-verification=ae63e0829f794f8eaa9d46794a8e6073"300
TXT"oci-domain-verification=mwjZ7A40UhcYmctnsvlpDQ4zebV3j9jVCIAqGBSkx"300
TXT"rzp-site-verification=a854b4a8b6cd7bfd0c5ebe4edcf00c18"300
TXT"pardot1009792=4c05d6fbc27aa34baa25bd9d175c4f3be8941b4c77ce5fba6e78022fdfe194fb"300
TXT"MS=ms79198677"300
TXT"_c5xkp6qqlmxx3yajtdb4hqhz82rsazn"300
TXT"v=spf1 include:_spf.google.com include:amazonses.com include:spf.mandrillapp.com include:spf.mtasv.net include:mktomail.com include:_spf.salesforce.com ip4:199.27.144.40 ip4:199.83.45.18 ip4:199.83.45.19 ip4:199.83.45.110 ip4:199.83.45.111 " "ip4:199.83.47.124 ip4:199.83.47.125 ip4:162.42.207.20 ip4:208.76.31.37 ip4:162.42.214.212 ip4:104.192.140.117 ip4:72.18.192.0/24 ip4:66.179.217.0/26 ip4:173.209.243.64/26 -all"300
TXT"OczFEA1OJs6vDuh7lvXFAcHDrCMg0Bgq35GaGBcrZqs"300
TXT"airtable-verification=1f9f5306621f76be14eb5cde11661c2d"300
TXT"d7kfp9gbnkkvp5vvphuv80s4oc"300
TXT"google-site-verification=0QeIVzKsJaBLMuz3ZQ1rVpVCmumDKYRlvZ8fRExJ81Y"300
TXT"MS=E75517AC6D8C7C76D0C87E3CF6ABD5F68B91610C"300
TXT"google-site-verification=neBJBV38v3xXAew00QEe1whxoBx-y0oo0-9840fBTek"300
CAA0 issue "digicert.com"360
CAA0 iodef "mailto:itops@oreilly.com"360
CAA0 issue "godaddy.com"360
CAA0 issue "pki.goog"360
CAA0 issue "amazon.com"360
CAA0 issue "letsencrypt.org"360

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 1h. The NS TTL at the parent is 2d and in the zone 1h; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: digicert.com, godaddy.com, pki.goog, amazon.com, letsencrypt.org.